Rotary pump



E. HILL ROTARY PUMP Aug. 19, 1924.. 1,505,707

Filed OGt. 24. 1923 INVENTOR MM ERNE Y I Patented na 19, 1924. 1,505,707 'QUNI'TED STATES PATENT oF FlcE.

nnmrnznn HILL, or scorn noRwALx, eonnne'rrcu'r, .assrenon 'ro r111; 1111.1. (2011-, A rnnssort & rumrcomrnmr, or NEW YORK, N. Y., A oonronnrron or DELA- ROTARY PUMP.

Application filed October 24, 1923.- SeriaI No. 670,453. To all whom it may concern: the friction and pack the joints againstleak- 55 Be it known that I, EBENEZER HILL, a age of the fluid being pumped. citizen of the United States, residing at In the accompanying drawings Fig. -1 South Norwalk, in the county of Fairfield shows a" central longitudinal section of a 6 and State of Connecticut, have invented a pump constructed according to the invennew and useful Improvement in Rotary Ttion. Fig. 2 shows a face view of the pump Pumps, of which the following is a specifioa-- with the head removed. tion. The casing 1 which is generally circular This invention relates to rotary pumps of 1n outline contains a cylindrical pum 'ingthe gear type, that is, those pumps which chamber 2 that is closed on one end 'Ey a have a rotor driving intermeshing gears for head 3 which is fastened to the casing by pumping or compressing fluids, more parany suitable means. The casing has an inticularly air and gases, although adapted take passage 4 on one side and a discharge for other fluids. 1 passage 5 on the other side while the head 15 The object .of the invention is-to provide has an intake port 6 leading from the. in- 1 such a pump withsimple means. for pretake passage to the pumping chamber, and venting leakage across the faces of the gear a discharge port 7 leading from the pumpteeth of the. fluid being pumped, which ing cham er to the discharge passage. Romeans retain the working elements suflicienttata'bly fitting and having a slight move- 20 1y free to enable the pump to start easily ment axially in the pumping chamber is a and speed up quickly, ut which are so derotor 8.. 'The hub 9 of the rotoris mounted signed that the tightness of, the joints subon anti-friction bearings 10 the inner ring ject toleakage is automatically increased 11 of which is fastened to the hub while and efficient lubrication is ensured as the the outer ring 12 is fitted so that it may 2 ,'pressure generated builds up, thus permithave a slight axial movement in the casing.

ting the parts tobe'made with less accuracy The driving shaft 13 is splined in the hub and fitted less closely than otherwise would of the rotor so that while the shaft will be required,'thereby reducing the cost of rotate the rotor it will not interfere with manufacture, minimizing the operating the axial movement of the rotor.

30 power, and. rendering the pump especially. Fastened in the rotor is an internally adapted for pumping light gases or comtoothed gear 14 and enga ing the teeth '85- pressing fluids to, a high degree. of this gear are the teeth 0% an externally This object is attainedby designing the toothed gear 15. .p The externally toothed rotor which contains and drives the -1ntergear is mounted on anti-friction bearings 16 35 nally toothed gear and the cooperating ex that are supported by a stud 17 fastened ternally toothed driven gear of different in the head. The stud is positioned out of number p of teeth, in such manner that it lme with the driving shaft'so that the axis may float with the gears axially in the casof the externally toothed gear will be eccening and these parts b'e-forced against the tric to the axis of the internally toothed 40 head which is attached to the'casing over gear. One of these cars has more teeth the pumping chamber, a springbeing arthan the other and t ey coact in a well ranged to cause the initial pressure of the known manner to effect the pumping or comparts against the head with suflicient closepression of fluids.

ness to allow the pressure to build up with- A spring 18 is arranged in a cavity 19 45 out causing undue friction, and pipe conin the casmg that communicates with the nections being made so. that the pressure of pumpin chamber, in' such mannerthat the the pumped fluid will be exerted on the spring t rusts a ainst the outer race ring back of the rotor'to supplement the spring 12 and through t e bearing presses the edge tension and keep the joints tight w1th, a of the rotor and the faces of the. umping force depending upon the discharge presgears against theinner face of t e head. sure, which connections also conduct lubri- Lubricant is introduced into this cavity. cant into the casing and allow it under the Leading from the reservoir 20 into which pressure to be forced between the wearing the fluid is pumped, to the cavity containing surfaces so as to at the same time reduce the spring is a pipe 21. The function 0 this connection is to admit discharge pressure to the cavity and permit it to be exerted on the back of the rotor. This connection also is adapted to conduct back lubricant which has been forced through the joints between the wearing surfaces and is passed out through the discharge pipe. A common type of gland packing 22 is arranged in the end of the casing to prevent leakage from the spring cavity around the driving shaft.

With this construction the rotor and the gears are initially pressed against the'head by the spring with just sufficient force to prevent leakage of the pumped fluid across the faces of the gear teeth when the pump is started. This enables the pump to be started easily. As the pressure builds up by the continued operation of the pump the discharge pressure is exerted on the back of the rotor and this pressure supplements and .soon becomes greater than that of the spring and keeps the joints tight with a v force proportional to the accumulated discharge pressure. If there were no spring to provide the initial pressure and no discharge pressure as when starting up the pump, in order to have the joints sufficiently tight to accumulate pressure it would be necessary to bore the pumping chamber to a very exact diameter and depth, and face off the rotorand gears with great accuracy so that they would bear perfectly on the inner face of the head. Under such conditions the parts would fit so closely that there would be an undue amount of friction, resulting in the requirement of an unnecessary amount of power. By having the rotor float and initially kept ti ht by the spring the parts may be fitted re atively loose, for the spring will hold the parts sufiiciently closeto permit of the necessary accumulation of pressure, and as the discharge pressure accumulates the required seal will be effected by the fiuid pressure. Lubricant filled into the spring cavity is carried bythe discharge pressure, between the working surfaces so as to reduce the friction and liquid seal the joints.

Such lubricant as passes through the pump is returned to the spring to permit the discharge pressure to accumulate and as the discharge pressure accumulates the tightness of the joints is increased proportionately, so that the pump will compress fluids up to. the limit of its siireraigth or limit of the driving power app 1e The invention claimed is:

1. A rotary pump comprising a casing containing a pumping chamber, a ported head closing one end of said chamber, said head having an intake to and discharge from the chamber, a rotor having one side closed and the other side open, rotatable in pumping means axially toward the head,

and means for conducting pressure accumulated by the pump to the back of the rotor for supplementing the tension of said spring and forcing the rotor against the head according to the accumulated ,pressure.

2. A rotary pump comprising a casing containing a pumping chamber, a ported head closing one end of said'chamber, said head having an intake toand discharge from the chamber, arotor having one side closed and the other side open, rotatable in and having an axial movement in said chamber so the open side will bear against the inner face of the head, internally toothed and externally toothed intermeshing gears located in and actuated by the rotor for pumping fluid, a spring for initially forcing the rotor and gears axially toward the head, and means for conducting pressure accumulated by the pump to the back of the rotor for supplementing the tension of said spring and forcing therotor against the against the inner face of the head, means located in and actuated by the rotor for pumping fluid, a spring for initially forcing the rotor and pumping means axially toward the head, and nieans for conducting discharge pressure to the pressure chamber back of the rotor, and thereby forcing the rotor against the head according to the degree of discharge pressure.

4. A rotary pump comprising a casing containing a pumping chamber, a ported head closing one end of' said chamber, said head having an intake to and discharge from the chamber, a rotor having one side closed and the other side open, rotatable in and having an axial movement in said chamber so the open side will bear against the inner face of the head, means located in and actuated by the rotor for pumping'fluid, and means for conducting pressure accumulated by the pump to the back of the rotor and thereby forcing the rotor and pumping means against the head according to the accumulated pressure.

5. A rotary pump comprising a casing containingv a pumping chamber, a ported head closing one end of said chamber, said head having an intake to and discharge from the chamber, a rotor having one side closed and the other side open, rotatable in and having an axial movement in said chamber so the open side will bear against the inner face of the head, internally toothed and externally toothed intermeshing gears located in and actuated by the rotor for pumping fluid, and means for conducting pressure accumulated by the pump" to the back of the rotor and thereby forcing the rotor and gears against the head according to the degree of accumulated pressure. 7

6. A rotary pump comprising a casing containing a pumping chamber, a spring chamber communicating with the pumping chamber and a passage from the pump discharge to said chamber, a ported head closmg one end of said pumping chamber, said head having an intake to and discharge from the pumping chamber, a rotor having one side closed and the other side open rotatable in and having an axial movement in said chamber so the openside will bear against the inner face of the head, means located in and actuated by the rotor for.

pumping fluid, and a spring located in said spring chamber for, in conjunction with the discharge pressure, forcing the rotor axially toward the head.

7. A rotary pump comprising a casing I containing a pumping chamber, a ported head closing one end of said chamber, said head having an intake to and discharge from the chamber, a rotor having one side closed and the other side open rotatable in and having an axial movement in said chamber so the open side will bear against the inner face of the head, internally toothed and externally toothed intermeshing gears movable axially with the rotor and rotated thereby for pumping fluid, a s ring for-t initially forcing the rotor axial y toward the head, and means for conducting pressure accumulated by the pump to the back of the rotor for supplementing the tension of said spring and pressing the rotor and gears against the head according to the degree of accumulated pressure.

8. A rotary pump comprising a casing containing a pumping chamber, a ported head closing one end of said chamber, said head having an intake to and discharge' from the chamber, internally toothed and externally toothed intermeshing ears rotatable in said chamber, anti-friction bearings supporting the gears, said bearings permittmg'an axial movement of said gears in said chamber so theymay bear against the inner face of the head, means for ro tating said gears, a spring for initially forcing the gears axially toward the head, and means forconducting pressure accumulated by the pump to the back of the gears for forcing them against the head with a pressure depending on the degree of accumulated pressure.

9, A rotary pump comprising a casing containing a pumping chamber with an intake to and discharge from said chamber, a head closing one end of said chamber, a rotor having one side closed and the other side open, rotatable in and having an axial movement in said chamber, internally toothed and externally toothed intermeshing gears movable axially with and rotated by the rotor for pumping fluid, and means for conducting pressure accumulated by the pump to the back of the rotor and forcing the gears against the head according to the accumulated pressure.

10; A rotary pump comprisinga casing containing a pumping chamber with an intake to and discharge from said chamber, a driving shaft, a rotor rotatable in and capable of an axial movement in said chamber, means connecting the shaft'and rotor whereby the shaft will rotate the rotor but not interfere with its axial movement,

means actuated by the rotor for pumping fluid, a spring for initially forcing the rotor axially toward one end of the pumping chamber, and means for conducting pressure accumulated by the pump to the back of the rotor for supplementing the tension of said spring. 7

11. A rotary pump comprising a casing containing a pumping chamber with an intake to and discharge from said chamber, a driving shaft, a rotor rotatable in and capable of an axial movement in said chamber, means connecting the shaft and rotor whereby the shaft will rotate the rotor but will not interfere with its axial movement, internally toothed and externally toothed intermeshing gears actuated by said rotor for pumping fluid, a spring for initially forcing the rotor'and gears axially toward one end of the pumping chamber, and means for conductin pressure accumulated by the ion pump to theack of the rotor for supplementing the tension of said spring.

12. A rotary pump comprising a casing containing a pumping chamber with an intake to and discharge fromisaid chamber and a pressure chamber communicatin with the axially toward one .end of the.pumping chamber, and means for conducting discharge pressure from the pump to the pres sure chamber back of the rotor.

13. A rotary pump comprising a casing having a pumping chamber with an intake Q and discharge from said chamber, a drivng shaft, a rotor rotatable in and capable 90f an axial movement in said chamber, 10 imeans connecting the shaft and rotor whereby the shaft will rotate the rotor but not interfere with its axial movement, means actuated by said rotor for pumping fluid, and means exerted against the back of the rotor for forcing the rotor axially against one wall of the pumping chamber.

14. A rotary pump comprising a casing having a pumping chamber with an intake to and discharge from said chamber, a driving shaft, a rotor rotatable in and capable of an axial movement in said chamber, means connecting the shaft and rotor whereby the shaft will rotate the rotor but not interfere with its axial movement, means actuated by said rotor for pumping fluid, and means for conducting pressure accumulated by the pump to and against the back of the rotor for forcing the rotor axially against one wall of the pumping chamber. v

15. A rotary pump comprising a casing having a pumping chamber with an intake to and discharge from said chamber, a pressure chamber, means connecting the discharge from the pumping chamber with the pressure chamber, a driving shaft, a rotor rotatable in and capable of an axial movement in said pumping chamber, means connecting'theshaft and rotor whereby the shaft will rotate the rotor but not interfere with its axial movement, means actuated by said rotor for pumping fluid, and a spring exerting pressure against the back of the rotor for forcing the rotor axially against one wall of the pumping chamber.

16. A rotary pump comprisinga casing containing a pumping chamber with an intake to and discharge from said chamber, a

driving shaft, a rotor rotatable in and capable of an axial movement in said chamber,

an anti-friction bearing supporting the rotor, means connecting;the shaftand rotor whereby the shaft will rotate the rotor but not interfere with its axial movement, means actuated by said rotor for pumping fluid, a spiral spring engaging a portion of said bearing and pressing the rotor axially toward one end of the pumping chamber,

and means for conducting pressure accumulated by the pump to the back of the rotor for supplementing the tension of said spring.

17. A rotary pump comprising a casing containing a pumping chamber with an intake to and discharge from said chamber, and a pressure chamber communicating with the pumping chamber, a driving shaft, a rotor rotatable in and capable of an axial movement in said chamber, means connecting the shaft and rotor whereby the shaft will rotate the rotor but not interfere with its axial movement, means actuated by said rotor for pumping fluid, and means for con-' ducting discharge pressure from the pump to the pressure chamber back of the rotor.

18. A rotary pump comprising a casing containing a pumping chamber with an intake to and discharge from said chamber and a pressure chamber communicating with the pumping chamber, a driving shaft, a rotor spring in the pressure chamber and thrusting against said rotor bearing for initially forcing the rotor and gears axially toward one end of the pumping chamber, and means for.

conducting accumulated discharge pressure to the pressure chamber back of the rotor for supplementing the tension of said spring.

.i I EBENEZER HILL. 

